Railway-carriage lighting.



H. ROSENTHAL.

RAILWAY'CARRMGE LIGHTING.

APPLICATION FILED 1u|.v1s, 192s. RENEWED MAR. 9.1911.

1 ,2353383. I v Patented July 31, 1917.

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H. ROSENTHAL. RAILWAY CARRIAGE LIGHTING.

APPLICATION FILED JULY 15, 19i3- RENEWED MAR. 9. 19H.

Patnted July 31, 1917.

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HANS ROSENTHAL, 0F BERLIN, GERMANY, ASSIGNOR TO JULIUS PINTSCH AKTIEN- GESELLSCHAFT, OF BERLIN, GERMANY.

RAILWAY-CARRIAGE LIGHTING.

Application filed July 15, 1913, Serial No. 779,179.

To all whom it may concern Be it known that I, HANS ROSENTHAL, a citizen of the German Empire, and residing at Berlin, German Empire, have invented certain new and useful Improvements in Railway-Carriage Lighting, of which the following is a description.

When it is desired to regulate the turning down of the lights of a whole carriage, not only by the attendant, altogether from the end of the car, without his having to attend to each lamp separately, but also to enable each passenger to adjust the light in his compartment as he wishes to light or dark with a single pipe connection for the gas or mixture of gas and air, considerable difficulties arise. If all the lamps are adjusted to full pressure, or light it is easily possible to throttle the gas pressure at the end of the carriage, so that all the lamps will be turned down. If, however, one or other of the passengers turns down his individual light, so that a second throt- 'tling of the pressure occurs in the lamp, it

is possible that the light will go out entirely owing to too great a reduction of the pressure, and to the fact that the other lamps, the individual cocks of which still stand open or at full pressure, would receive all the gas.

The object of the present invention is, in such a case, to provide means by which, when some of the lamps are burning full and others turned down by the passengers, to enable the attendant even then to effect a general turning down of all the lights from the end of the carriage. This is effected by providing the gas feed with a low pressure, which, however, remains constant, even with varying gas consumption in the various gas lamps, by the aid ofan auxiliary pressure regulator, attached to the gas holder and to the main gas regulator, and adapted to control the latter, or by a separate auxiliary regulator to control the pipe system. In the accompanying drawings Figure 1 is a diagrammatic representation showing the general arrangement of the gas holder, regulators, pipes, cocks and lamps. Figs. 2 and 3 are diagrammatic vertical sections showing two modifications of the embodiment of the main and auxiliary regulators. Fig. 2 is a detail.

In the general arrangement of the plant illustrated in Fig. 1, the gas passes from Specification of Letters Patent.

- Patented July 31, 1917.

Renewed March 9, 1917. Serial No. 153,741.

the holder or recipient a through a pressure regulator Z), adjusted to the ordinary Working pressure; it then passes the cock 0, and p pe 0 and is fed to the lamps through the pipe 7. A second regulator (Z, adjusted to a less pressure is mounted in a branch pipe 0 and is provided with a cock 6. Beyond the cocks c and 0 the two conduits are combined to form a common conduit f through which the gas or mixture of gas and air is conducted to the various lamps g, g 9 g by means of branch pipes f, f 7, f.

Each of these lamps possesses one light and dark adjustment mechanism for the passengers, illustrated, for instance, in connection with the lamp 9 and consisting, for instance, of a gas cock it having a change lever 71 and a by-pass 70 with a throtthug mechanism Z. This mechanism is known and forms no part of the present invention.

Assuming that the attendant has opened the system for the use of the passengers the cooks 0 and e will be in the position shown in the drawings, 2'. 6. gas will only pass through c to the pipe 7 under normal pressure, 6 being closed. Inthis case the passengers can adjust their lamps to light or dark by operating the lever 1' as they desire.

If, on the other hand, the railway attendant has closed the cock 0 and opened 6, there will be so little pressure in the pipe 7 and consequently in the lamp, that the flame will still burn dark even if the light and dark adjusting device is adjusted to light, unless special adjustment of the reduced pressure in (Z is made in relation to the normal pressure in b.

If however the reduction of pressure in d is adjusted in relation to the normal pressure in b and the throttling in the bypass pipes in correspondingly regulated, it is possible to supply the turned down flame with sufiicient gas, even when some of the light and dark adjusting devices are in the reduced position and some fully open. Since, however, the adjustment of the lamp to the full light when all the lamps are also be attained, by means of the arrange ments shown in Figs. 2 or 3.

In Fig. 2 the object is attained by the arrangement of a pressure chamber (Z having a membrane on located above the pressure regulator 72 and having a special form of gas cut elf e, which relieves the pressure chamber (Z by being placed into communication with theouter air when the system is working at normal working pressure. In this case the gas passes from the holder (6 to the pressure regulator I) the cock 0 and the conduit to the lamps. When the latter are burning at normal pressure the cock 0 is adjusted to the position shown at Fig. 2, i. e. the interior of the regulator (Z is in communication with the open air through ports 6 0 The pressure chamber (Z has a membrane m connected rigidly to the membrane a of the regulator b. When the cock 6 is turned to the position shown in Fig. and the branch pipe 0 thus opens up communication between the interior of the regulator (l and the pipe full gas pressure will dietend the membrane m downwardly and exer cise pressure on the membrane n of the regulator 6 thus throttling the gas supply to 7 and causing all the lamps to burn small.

The device illustrated in Fig. 3 is the same as the other devices, from the pipe 1 onward. In this case, the idea of the invention carried out by means of a special construction of the pressure regulator Z) according to which, in addition to the normal membrane n, a second membrane 772- is fitted in the bottom of the regulator Z). The branch pipe 0 opens into the main regula= tor 7) beneath the membrane m, which latte is connected by a lever system 8 s fulcruined at s, with the main membrane a, said lever system carrying the regulating valve *1. The gas passes through pipe 0 to the main pipe to supply normal pressure to the lamps when the cock 2% is closed. The

construction of cock Z1 is similar to that of cook a. Thus when the cock t is closed the space beneath the membrane on is in communication with the open air and normal pressure passes to the supply pipe 7. It the cock t is opened, full pressure passes beneath the membrane on and increases the load on 1 thus decreasing the pressure.

I claim as my invention l. in a plant for lighting railway carriages the combination with the ordinary pressure regulator and full pressure pipe system, of an auxiliary regulator associated therewith, means for placing said auxiliary regulator in communication with the full pressure pipe system and means for cutting oil the ordinar Y pressure regulator from the system. 7

in a plant for lighting railway carriages with gas comprising a gas holder and a single pipe conduit to connect up the lamps, a cut off valve in thesaid conduit, an ordinary pressure regulator in the main pipe between the cut oil and the gas holder and a controlling regulator connected up to the ordiliary pressure regulator, means for placing said controlling regulator in communicat-ion with the ordinary regulator to reduce the gas pressure in the pipes and means for opening the controlling regulator to'the air to relieve the said ordinary regulator.

3. In a plant for lighting railway carriages, of the class specified, the combination with the ordinary regulator of an auxiliary regulator connected up to the ordinary regulator and means for placing said auxiliary regulator in communication with the full pressure pipe system as also means for cutting off such communication and placing the said auxiliary regulator in communication with the open air for the purpose specitied.

l. In a plant for lighting railway carriages comprising in combination a full pressure pipe system, including a main gas holder, an ordinary pressure regulator, and an auxiliary regulator attached to'said gas holder and to said ordinary pressure regulator and adaptedto control the latter.

In testimony whereotI aflix my signature in the presence ot'two witnesses.

HANS BOSENTHAL. I

Witnesses HENRY Hasrnn, ll onnnaran Hnorr.

Etc-pies or this patent may be obtained torfive' cents each, by adfiressing; the Commissioner of Patents,

Washington, 3'). U. 

